I have a 2017 Passat B8 BiTDi 240bhp with 300k on the clock. 2 annoying problems have developed and at the same time. It could be a coincidence.

Firstly my keyless entry has failed. I get the message “ keyless entry system faulty” on the dash with multiple beeps. If I disconnect the battery and reconnect the fault disappears for a day but returns. No fault codes on VCDS.

Secondly my start stop isn’t working too well. I get the message “ Engine must be running”. I only ever get this message when the car is doing a regen but now it just appears for no reason. It now appears even if the car isn’t doing a regen. When my battery is low I usually get “ power consumption high” so i doubt it’s the battery.

My battery isn’t 100% to be fair however according to my battery monitor my voltages are no worse than they were a year ago and I never had these problems then.

Any ideas?